Combined type-writing and computing machine.



lF.gA. HART. Y COMBINED TYPE WRITING AND COMPUTINGMACHINE.

APPLICATION FILED SEP-T2216', 1914.

Patented June 6,` 1916.

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P. A. HART. 'COMBINED -TYPE WRITING AND COMPUTIN'GIVIACHINE.

APPucATloNFILEuE'PLls,1914.

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TO UND RATION OF NEW YORK.

UNTTED STATES PATENT OFFICE.

FREDERICK I\HART, OF NEWARK, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS,

00D COMPUTING MACHINE COMPANY, OF NEW' YORK, N. Y., A. COBRO- coMmNED TYPE-WRITING AND COMPUTING MACHINE.

specification of Letters Patent.

`Patented June 6, 1916.

. Original application liled December 10, 1908, Serial No. 466,836. Divided and this application yfiled September 16, 1914. Serial No. 861,935.

, To all whom t may concern.'

Be it known that I, FREDERICK A. HART, a citizen of the United States, residing in Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Combined Type-' lVriting and Computing Machines, of which the following is a specification.

My invention relates to computing machines and is herein disclosed as applied to a combined typewriting and computing Inachine of the Underwood-Hanson type which is of the general form disclosed in the United States patent to Hans Hanson, No. 816,319, dated March 27, 1906, and Nos. 905,421 and 905,422 dated December 1, 1908. In said machine, the numeral keys of the typewriter when operated in the adding zone are caused to set up pins on computation bars' which pins and bars may be designated as preliminary representation devices, there being one pin set up on each bar, the' pin correspondlng to the digit written, and the rack bar corresponding to the letter-space in the travel of the typewriter carriage. Vhen a number has thus had all of its digits set up,

it is carried into computing wheels by means of a general operator which includes a cross bar 'that comes forward, strikes the ends of the depressed pins and carries forward the computation bars by means of said pins thereby turning the computing wheels.

The present invention is especially directed to preventing overthrow of the computation bars by the general operator. If these bars are properly arrested, there is littlc-danger of overthrowing the computing wheels because the computing wheels are-1 constantly engaged by spring detents and y.

said detents tend to arrest their wheels at the proper place, and they will return them from a slight overthrow.

The stroke of the general operator is i always the same butthe amount to which it will turn the various computing wheels depends on the pins depressed. The rack bars are usuall arrested by a stop which intercepts the epressed pins. To avoid accidents it is advantageous to have a stop for arresting the computation bars by their pins, which is normall out of the path of any pins accidentally epressed, and of an other parts, but which becomes effective Just at the moment when it is desired to arrest the computation bars. To this end, I have arranged that the stop shall normally stand clear of the computation bars and other parts, but as the general operator approaches the end of its forward stroke, said stop is swung into position bya cam on the general operator, so that it will intercept the ends of the depressed pins. Other features and advantages will hereinafter appear.

This application is a division of my application No. 466,836, filed December 10, 1908.

In the accompanying drawings, Figure 1 is a sectional side ,view of an Underwood- Hanson combined typewriting and computing machine, showing my invention as ap.- plied thereto. Fig. 2 is a section of the computing mechanism proper on a larger scale. Fig. 3 is a fragmentary sectional View taken from the side opposite to Fig. 2.

In the Underwood typewriting machine, numeral keys 5 and alphabet keys 4 depress their key levers to cause said levers to swing type-bars 3 upwardly and rearwardly,

adding zone, the numeral keys thereof are caused to set up digits representing numbers onfcomputation bars c, said bars being normally in'ineffective position, but Ain the adding yzone being raised one at a time into effective positionk'so that they will be within range of pin-setting bars b", with the result that when any numeral key is depressed, the pin-setting bar bwhich moves therewith, will depress a corresponding pin cls on Athe raised computation bar c, said pin representing the digit printed by that numeral key. The computation bars c are shown 1n their normal position in Fig.` 1 and they are raised therefrom one after another by a dog f, which is mounted on the typewriter carriage. Said dog f, to do this, raises lone after another jacks f1., said jacks being pivoted to a bar f1 with result that the rear ends thereof will depress the rods f1. Said rods are connected to the computation bars c, by levers f1 in which the bottoms of the 5 rods f1 rest, and the levers raise the bars c by lugs f2 on transposition linkages f. The connections are such that the righthand' lever f1 raises the left-hand bar c, and so on in reverse order. This is possible because the levers f1v are of'v'arying length so that each operates'only its own linkage f2?, and the lug f"g for the left-hand bar c is on the linkage operated by the right-hand lever f, and so for the others in reverse order. When a computation bar is thus raised, the depression of any numeral key will carry down its pin-setting bar o? with the result that said pin-setting bar will.

strike the proper pin c on the bar c, and. depress said pin, so that the lower end of said depressed pin will extend below the bottom of the bar c to a distance shown in Figs. 2 and 3. When a series of pins have thus been depressed, one pin on each bar, a`

cross-bar c formingv part of a general operator is moved forwardly by means of aV handle c, and strikes the ends of the de pressed pins carrying the computation bars c forward', thereby causing the computing wheels a to be turned by said bars. For so turning said wheels, the front ends of the bars c are provided with racks which mesh. with pinions a1 connected to the computing wheels a. On the return stroke of the gen# eral operator, a second cross bar 01 forming part ofv said operator, strikes lugs ca onthe.

computation-bars c thereby returning", the

'bars to theirnormal position. The -bars do not turn the computing wheels a on`,.thei1- 40' return stroke, 1 because ofA pawl and' ratchet connections between-'the pinionsaa1 and the wheels a, Said-connectionsvnot being shown herein.

The handle c mevesthe general operator a by means. of a vsegment c fastyto the shaftl 012 oni which the handle c is fast, said segment meshing with anidle pinion c, which pinion' in turn. meshes with 'the'rack bar c?. `forming part'of-the general, operator, there being a-rackfbar c' and pinion c1v=on each sideof'the machine., The.;rack bars c" and the cross barsfzV andctaform a rigid frame for the general operator. Before beginning a new computation, all of the pins are vreset by the handle c through connections not material in the present invention. K

vThe numeral `wheels areA normallyheld by spring detents a. Their carry-over devices, which include pinions a1". and apower 1" :driven shaft al* connectedto the general operator, may be of the same general construc tion as is disclosed in theHanson patents aforesaid.

In order to prevent overthrow ofthe computation barsc on-theforward ,stroke of the 'stood that as the general operator moves forgeneral operator, the depressed pins of said bars are automatically intercepted by a stop bail t3 which normally lies in its downmost ineffective positionseen in Fig. il. When the general operator lcomes `forward, said bail is moved to its effective position seen in Figs. 2 and 3, wherein itis raised adjacent the computation bars c, so that it lies in the path of the bottom ends of the depressed pins. To thus raise it, the general operator is provided with a cam t formed as an exi l tension of a plate t8 fast to the side rack c7 of -the general operator, said cam being adapted to raise said bail in the interval between a depressed pin and the pin next in front thereof. When said bail is thus y raised, the computation bar c is positively caught at the end of the computing opera-Y tion between said bail and the cross bar c of the general operator, as shown from one g5 'paratively long and have a short swing, so.

that the thrust thereon is nearly horizontal. Thus the arresting of the bars c thereby, has practically no tendency to raise them by rotation of the shaft' 765.'

One result of having the bail t' normally in ineffective position is that the rack har is .always arrested by the rearmost pin thereon. This is advantageous because if `two 10E pins were accidentally depressed, the general operator would drivesaid barby the .y rearmostdepressed pin, while if the stop bail t3 were fixed in position, it would arrest the rack bar c by the front depressed pin` thereon. VThe driving of the rackbar by one pin, and the arresting of it by another in such a case, might either wreck the machine or cause the computation to bel neaningless, since there are usually several rack1 bars driven by their pins at each computation.

' Such a result is made impossible by having the bail t8 normally inl ineffective `position and Vraised to effective position'fonly'after Y .the pin next the one driven'bythe generalize operator has come to where the/bail t should stand. v i When a number is computed consisting of. several digits, such as 381, it will 4be underward the cross-bar c9 engages first the pin corresponding to the digit 8 on the tens rack baryand beglns to move the same forward.v

It, next encounters the pinyzorresponding to the digit 3 on the hundreds rack barrmd` moves it forward, finally picking up the rack in units order and moving it forward one space. Atthe time the rack bar in units order is picked up, the pins 3, 8 and 1 on their respective rack bars are in alinem'ent,

and during 'the interval between the picking-up of the units rack bar and the end of its stroke, the general operator brings into action the overthrow-preventing bail t3. It will be understood, of course, that the rack bar having the lowest digit value set thereon will be the-last one picked up. AIt will also be clear that when the locking bail becomes effective, allof the pins constituting the number being computed, are'in alinement.` A

Variations may be resorted to within the scope of the invention, and portions ofthe improvements may be used without others.

Having thus described my invention, I claim:

1. In a computingmachine, the combination with reciprocatingrack bars comprising settable pins, of computing wheels driven by the racks on said rack bars, a

reciprocating general operator for driving said bars, and a stop normally7 in ineffective position but adapted to be swung bysaid general operator to effective position to arrest said bars by said pins.

A 2. In a computing machine, the combination with computing wheels, of reciprocatf ing rack bars for driving said wheels, pins settable on said rack bars, a general operator for driving said rack bars by said pins when set,a stop for engaging the set pins to positively arrest the rack bars, said stop normally out ofthe path of said pins, and means to enable such engagement'between said stop and the setpins to take piace.A

' 3. In a computing machine, the combination with computing wheels, of rack bars for driving said computi-ng wheels, a source of 'power for drivingsaid rack bars,- a general operator driven by said source of power for so driving them, pins settable on Said rack bars to be engaged by said general opera-tor for driving the rack bars, a 'stop norv mally in ineffective position, and means for raising said stop lto effective position as the .pins engaged by the general loperator approa h itto cause said stop to arrest said Arack ars by said pins. .l

4. In a ,computing machine, the combination with computation Vracks and digit pins' settable -thereon, of Va bar standing across --the racks and adapted to be movedv to drive the racks by the set pins, across the'racks for engaging the set pins but normally in lnef'fective position, and

a stop extending eans for-'shifting said stop to effective positionto intercept theprojecting pin after the next adjacent pin lhas cleared said stop.

5. In a computing machine, the cgrnbination with computation racks and digit pins` settable thereon, of a bar standing across the racks and adapted to b'e moved to drive the racks by the set pins, a stop extending across the racks for engaging the set pins but'normally in ineffective position, and a cam moving with Said cross bar-for shifting said stop to effective position to intercept the projecting pinl after the next adjacent pin hasA cleared said Stop.

6.1In a computing machine, the `combination of computing devices, of actuating means therefor, one for each computingdevice, said actuating means having pins seti table: thereon to determine the differential .movement of said devices, means for moving the actua-ting means each through a distance determined by the pin set thereon, said pins being in alinement just prior to the completion o 'f the movement of the actuating means, and af bar' movable transversely into yengagement kwith thev alined pins, to prevent'- overthrow of the-actuating'means at the completion of their movement.

7 In a computing machine, the combina- I tion with computing wheels, of rack bars for driving said oomputin mwheels, a power shaft for driving said rank bars', a general operator driven by said power shaft for so f driving them, pins settable on saidrack .barspifnsi 8. In a computing machine, the combination with bars having pins settable thereon, l

of computing wheels driven by said bars, a general operator for driving'said bars conc'pmitantly, and means for always simultaneously arresting all of saidbars by the pins set. f

A9. In a computing machine,'the'combina I tion with numeral Wheels and rack-bars for arms carrying said stop, a shaft on which vsaid arms aremounted, a general operator for driving said'rack bars, and a cam on said operator for operating said shaft.

10. In a computingl machine, the combination with computing wheels, of rack bars comprising settable pins, a general operator for driving said rack bars by said pins to turn said wheels, a cam on said operator, and a stop for arresting said rack bars and operable by said cam.

, 11. In a vcomputing machine, a register, and means for actuatingthe same, including preliminary representation devices, and an o peratlng carriage for rendering the set preliminary representation devices operative on "said register, in combination with a movable stop device, operative on said preliminary representation devices,

at the limit of the 13o 1`1o turnlng them, -of a stop'lfor said rack bars,

register actuating movement of said operat-` .ing.`a1 r1age, to prevent over-rotation of the l ation on the said preliminary representation devices, at the limit of the register actuating movement of said operating carriage, to prevent over-rotation of the register, substantially as described.

13. In a computing machine, a register,`

and means for actuating the same, including register bars having key-*set unit pins,r and an operating carriage for rendering said reg-. ister bars operative on said register, in combination with a unit pin stop, and means whereby said `stop is thrown into a in interceptin-g position, at the extreme llmit of theregister actuating movement of said operating carriage, toprevent over-rotation of the register, substantially as described.

14. In a computing machine, a register, and means for actuating the same, including preliminary representation. devices, and an operating carriage for rendering the set preliminary representation devices operative on said register, in combination with a vertically movablestop blade, and a cam on said carriage operative to.,move said stop blade into aV position to intercept the movements of the set preliminaryrepresentation devices, at the limit ofthe register actuating movement of said operating. carriage, substan-` tially as described.

15. In a compting machine,l a register,

andmeans for actuating the same, including Y register bars, having key-set unit pins, and an operating carriage for rendering said register bars operative o n said register, in com-` bination with a vertically movable unit pin stop blade, and a cam on. said carriage operative to raise said stop blade into a pin 1ntercepting position at the limit of the regis- Vter actuating movement of sa1d carriage,

substantially as described.

Copie: "ot this patent may be obtained for v'e sont; eacli, deafening the wllhhlltl, D. cj.

16. In a computing machine, a register, and means for actuating the same, includin register bars, having key-set unit pins, an( an operating carriage for rendering said register bars operative on said register, in combination with a pivoted bail having a cam arm and a stop blade, and a cam on said carriage operative 'on said cam arm to rais` the stop blade of said bail into a pin intercepting position, at the limit of the register actuating movement of said carriage, substantially as described.

17. In a computing machine, the combination, with computing Wheels, individual drivers therefor, and operating means for said drivers; of pins settable on said drivers to 'dtermine the extent of rotation of said Wheels by said drivers; a stop engageable with the set pins to positively arrest said drivers, said stop normally out of the path -of said pins; and means to enable such engagement between said stop and the set pins tov take place.

. 18. In a computing machine, the combination, with computing Wheels, individualv -drivers therefor, and operating means for stop into the path of the set pins, to enable such engagement to take place.

19. In a computing machine, the combination, with computing wheels, individualdrivers therefor, and operating means forv said drivers; of pins settable on said drivers -to determine the extentof rotation of said Commissioner vof retenu se"E 

